Though using AN and CJ to improve secrecy is common in the secrecy literature, the application of AN or CJ to RIS-aided system is yet in the nascent stage. The authors in [1]} first investigated the joint
transmit beamforming with AN and RIS reflect beamforming
in an RIS-aided secure communication system to maximize the achievable secrecy rate.
The authors in [2]} obtained the optimal secure beamforming and phase shift matrix for the RIS in a multiple-input single-output (MISO) system with a friendly jammer by maximizing energy efficiency.
In [3]}, the authors deployed an RIS not to aid information transmission, however but as a jammer to redirect the energy of the confidential signal and deteriorate the reception at the eavesdropper. In this context, we also mention that authors in [4]} used jamming to aid eavesdropping and cooperation between the jammer and eavesdropper was considered.
